F1 at start up

I have an older HP Pavilion 1G that I always have to push F1 to load windows during start up. It originally came with windows 98 and years ago I upgraded it. It works fine but I want to give it to my kids to use and need to know how to fix the F1 issue. It does not ask me to push either F1 or F2 it loads and says push F1 to continue. How do I fix it?

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